Shaping fixture



'Feb. 26, 1946.

Filed March so, 1945 n 5 a l l 7- z .z w m; 0 u 2 M m Patented Feb. 26,1946 SHAPING FIXTURE Albert F. Emrich, Valley Stream, N. Y.

Application March 30, 1945, Serial N 0. 585,753

(Granted under the act of March 3, 1883, as amended April 30, 1928; 370O. G. 757) 1 Claim.

This invention relates to a device for reshaping the inner arcuatesurface of a cylinder.

The invention is described in connection with its use in reshapingbearing circles or azimuth circles which frequently are knocked off thecompass stand during battle or otherwise misshapen through accident. Itis noted that in the past when deformation occurred, the reshaping ofthe rings was accomplished by dropping or bouncing the rings on a workbench, fioor, or other surface. In the case of sharp bends a raw hidehammer was used while the edge of the ring was held against the workbench.

One object of this invention is a device to reshape accurately innercylindrical surfaces which have become deformed or distorted.

Another object of this invention is a device to reshape bearing circlesand azimuth circles with such a high degree of accuracy that subsequentcalibration of the circles will allow the use of these circles fornavigational or piloting purposes.

Further objects and advantages of this invention, as well as itsconstruction, arrangement and operation, will be apparent from thefollowing description and claim in connection with the accompanyingdrawing, in which,

Figure 1 is a top plan view of the shaping fix ture with portions brokenaway for clarity of illustration.

Figure 2 is a vertical section on the line 22 of Figure 1 and showingthe operation of the device in connection with the reshaping of abearing circle.

Figure 3 is a front view of the operating lever.

The shaping fixture has two generally semicircular sections lil-lil,each section l having a U shaped recess ll. When assembled together thecombination of the two U shaped recesses l l-i I will form a generallysquare hollow for the reception of turnbuckle i2.

Turnbuckle I2 comprises a central knurled cylinder l3 and two threadedstuds I l-45, extending therefrom. Stud 14 is left hand threaded whilestud I5 is right hand threaded. Cylinder i3, also, has two bores l6-l6for the reception is turned by hand until the semi-circular sectionsl0l0 are in contact with inner surface 23. The operating lever I! isthen inserted in either bore l6 and the semi-circular sections Ill-I0are forced apart until the bearing circle 22 resumes the accuratecontour necessary for its position on a compass stand.

It is to be understood that semi-circular sections l0-l0 are accuratelymachined to insure the precise shaping of the bearing circle 22.

It is to be understood that various modifications and changes may bemade in this invention without departing from the spirit and scopethereof as set forth in the appended claim.

The invention described herein may be manufactured and used by or forthe Government of the United States of America for governmental purposeswithout the payment of any royalties thereon or therefor.

What is claimed is:

A fixture for reshaping an internal cylindrical surface, said fixturecomprising two generally semi-circular members, the said semi-circularmembers having their diameters closely parallel, a U shaped recess ineach of said semi-circular members, the openings of said U shapedrecesses being on the diameters of said semi-circular members, a lefthand threaded bore in the base of the U of one of said recesses, a righthand threaded bore in the base of the U of the other of said recesses, aknurled cylinder within said recesses, said knurled cylinder having twothreaded studs integral therewith, one of said threaded studs having aleft hand thread and received in said left hand threaded bore, the othersaid stud having a right hand thread and received in said right handthreaded bore, said knurled cylinder having a plurality of bores, alever, said lever being located in one of said knurled cylinder bores, aplurality of cylindrical apertures in each of said semi-circularmembers, said apertures being located between said recesses and thecircumferences of said semicircular members, said apertures beingparallel to said knurled cylinder and opening on the diameters of saidsemi-circular members, the

